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1.д³öÁ½¸öº¯Êý£¬·Ö±ðÇóÁ½¸öÕûÊýµÄ×î´ó¹«Ô¼ÊýºÍ×îС¹«±¶Êý£¬ÓÃÖ÷º¯Êýµ÷ÓÃÕâÁ½¸öº¯Êý£¬²¢Êä³ö½á¹û¡£Á½¸öÕûÊýÓɼüÅÌÊäÈë¡£
#include<stdio.h>
int gcd(int,int);
int lcm(int,int);
int gcd(int m,int n)
{
if(m%n==0)
return n;
else
return gcd(n,m%n);
}
int lcm(int m,int n)
{
return m*n/(gcd(m,n));
}
int main()
{
int a,b,t;
printf("ÊäÈëÁ½¸öÕûÊý\n");
scanf("%d %d",&a,&b);
if(a-b<0)
{
t=a;
a=b;
b=t;
}
printf("×î´ó¹«Ô¼ÊýΪ%d\n",gcd(a,b));
printf("×îС¹«±¶ÊýΪ%d\n",lcm(a,b));
return 0;
}

2.Çó·½³Ìax2
+bx+c=0µÄ¸ù£¬ÓÃ3¸öº¯Êý·Ö±ðÇóµ±b2
-4ac´óÓÚ0£¬µÈÓÚ0ºÍСÓÚ0ʱµÄ¸ù²¢Êä³ö½á¹û¡£´ÓÖ÷º¯ÊýÊäÈëa£¬b£¬cµÄÖµ¡£
#include<stdio.h>
#include<math.h>
int f1(float,float,float);
int f2(float,float);
int f3(float,float,float);
int f1(float a,float b,float c)
{
float t,x1,x2;
t=sqrt(b*b-4*a*c);
x1=((0-b)+t)/2/a;
x2=((0-b)-t)/2/a;
printf("·½³ÌÓÐÁ½¸öʵ¸ù\nx1=%f\nx2=%f\n",x1,x2);
return 0;
}
int f2(float a,float b)
{
float x;
x=(0-b)/2/a;
printf("·½³ÌÓÐÒ»¸öʵ¸ù\nx=%f\n",x);
return 0;
}
int f3(float a,float b,float c)
{
float t,p,q;
t=sqrt(4*a*c-b*b);
p=(0-b)/2/a;
q=t/2/a;
printf("·½³ÌÓÐÁ½¸öÐé¸ù\nx1=%f+%fi\nx2=%f-%fi\n",p,q,p,q);
return 0;
}
int main()
{
float a,b,c;
printf("ÊäÈëa b c\n");
scanf("%f %f %f",&a,&b,&c);
if(b*b-4*a*c>0)
f1(a,b,c);
else
{
if(b*b-4*a*c<0)
f3(a,b,c);
else
f2(a,b);
}
return 0;
}
3.дһ¸öÅÐËØÊýµÄº¯Êý£¬ÔÚÖ÷º¯ÊýÊäÈëÒ»¸öÕûÊý£¬Êä³öÊÇ·ñËØÊýµÄÐÅÏ¢¡£
#include<stdio.h>
#include<math.h>
int judge(int);
int judge(int x)
{
int i;
for(i=2;i<=sqrt(x)+1;i++)
{
if(x%i==0)
return 0;
else
continue;
}
return 1;
}
int main()
{
int t,n;
printf("ÊäÈëÒ»¸öÕûÊý\n");
scanf("%d",&n);
t=judge(n);
if(t==1)
printf("ÊÇËØÊý\n");
else
printf("²»Ê


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